Annotation of embedaddon/libiconv/srcm4/longlong.m4, revision 1.1
1.1 ! misho 1: # longlong.m4 serial 14
! 2: dnl Copyright (C) 1999-2007, 2009 Free Software Foundation, Inc.
! 3: dnl This file is free software; the Free Software Foundation
! 4: dnl gives unlimited permission to copy and/or distribute it,
! 5: dnl with or without modifications, as long as this notice is preserved.
! 6:
! 7: dnl From Paul Eggert.
! 8:
! 9: # Define HAVE_LONG_LONG_INT if 'long long int' works.
! 10: # This fixes a bug in Autoconf 2.61, but can be removed once we
! 11: # assume 2.62 everywhere.
! 12:
! 13: # Note: If the type 'long long int' exists but is only 32 bits large
! 14: # (as on some very old compilers), HAVE_LONG_LONG_INT will not be
! 15: # defined. In this case you can treat 'long long int' like 'long int'.
! 16:
! 17: AC_DEFUN([AC_TYPE_LONG_LONG_INT],
! 18: [
! 19: AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int],
! 20: [AC_LINK_IFELSE(
! 21: [_AC_TYPE_LONG_LONG_SNIPPET],
! 22: [dnl This catches a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004.
! 23: dnl If cross compiling, assume the bug isn't important, since
! 24: dnl nobody cross compiles for this platform as far as we know.
! 25: AC_RUN_IFELSE(
! 26: [AC_LANG_PROGRAM(
! 27: [[@%:@include <limits.h>
! 28: @%:@ifndef LLONG_MAX
! 29: @%:@ define HALF \
! 30: (1LL << (sizeof (long long int) * CHAR_BIT - 2))
! 31: @%:@ define LLONG_MAX (HALF - 1 + HALF)
! 32: @%:@endif]],
! 33: [[long long int n = 1;
! 34: int i;
! 35: for (i = 0; ; i++)
! 36: {
! 37: long long int m = n << i;
! 38: if (m >> i != n)
! 39: return 1;
! 40: if (LLONG_MAX / 2 < m)
! 41: break;
! 42: }
! 43: return 0;]])],
! 44: [ac_cv_type_long_long_int=yes],
! 45: [ac_cv_type_long_long_int=no],
! 46: [ac_cv_type_long_long_int=yes])],
! 47: [ac_cv_type_long_long_int=no])])
! 48: if test $ac_cv_type_long_long_int = yes; then
! 49: AC_DEFINE([HAVE_LONG_LONG_INT], [1],
! 50: [Define to 1 if the system has the type `long long int'.])
! 51: fi
! 52: ])
! 53:
! 54: # Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works.
! 55: # This fixes a bug in Autoconf 2.61, but can be removed once we
! 56: # assume 2.62 everywhere.
! 57:
! 58: # Note: If the type 'unsigned long long int' exists but is only 32 bits
! 59: # large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT
! 60: # will not be defined. In this case you can treat 'unsigned long long int'
! 61: # like 'unsigned long int'.
! 62:
! 63: AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
! 64: [
! 65: AC_CACHE_CHECK([for unsigned long long int],
! 66: [ac_cv_type_unsigned_long_long_int],
! 67: [AC_LINK_IFELSE(
! 68: [_AC_TYPE_LONG_LONG_SNIPPET],
! 69: [ac_cv_type_unsigned_long_long_int=yes],
! 70: [ac_cv_type_unsigned_long_long_int=no])])
! 71: if test $ac_cv_type_unsigned_long_long_int = yes; then
! 72: AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], [1],
! 73: [Define to 1 if the system has the type `unsigned long long int'.])
! 74: fi
! 75: ])
! 76:
! 77: # Expands to a C program that can be used to test for simultaneous support
! 78: # of 'long long' and 'unsigned long long'. We don't want to say that
! 79: # 'long long' is available if 'unsigned long long' is not, or vice versa,
! 80: # because too many programs rely on the symmetry between signed and unsigned
! 81: # integer types (excluding 'bool').
! 82: AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET],
! 83: [
! 84: AC_LANG_PROGRAM(
! 85: [[/* For now, do not test the preprocessor; as of 2007 there are too many
! 86: implementations with broken preprocessors. Perhaps this can
! 87: be revisited in 2012. In the meantime, code should not expect
! 88: #if to work with literals wider than 32 bits. */
! 89: /* Test literals. */
! 90: long long int ll = 9223372036854775807ll;
! 91: long long int nll = -9223372036854775807LL;
! 92: unsigned long long int ull = 18446744073709551615ULL;
! 93: /* Test constant expressions. */
! 94: typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll)
! 95: ? 1 : -1)];
! 96: typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1
! 97: ? 1 : -1)];
! 98: int i = 63;]],
! 99: [[/* Test availability of runtime routines for shift and division. */
! 100: long long int llmax = 9223372036854775807ll;
! 101: unsigned long long int ullmax = 18446744073709551615ull;
! 102: return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
! 103: | (llmax / ll) | (llmax % ll)
! 104: | (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i)
! 105: | (ullmax / ull) | (ullmax % ull));]])
! 106: ])
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